SDL_GetAudioStreamAvailable and SDL_GetAudioStreamAvailable return error codes

include/SDL3/SDL_audio.h

@@ -1309,7 +1309,8 @@ extern SDL_DECLSPEC int SDLCALL SDL_GetAudioStreamData(SDL_AudioStream *stream,
  * clamped.
  *
  * \param stream the audio stream to query.
- * \returns the number of converted/resampled bytes available.
+ * \returns the number of converted/resampled bytes available or a negative
+ *          error code on failure; call SDL_GetError() for more information.
  *
  * \threadsafety It is safe to call this function from any thread.
  *
@@ -1341,7 +1342,8 @@ extern SDL_DECLSPEC int SDLCALL SDL_GetAudioStreamAvailable(SDL_AudioStream *str
  * clamped.
  *
  * \param stream the audio stream to query.
- * \returns the number of bytes queued.
+ * \returns the number of bytes queued or a negative error code on failure;
+ *          call SDL_GetError() for more information.
  *
  * \threadsafety It is safe to call this function from any thread.
  *